<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 级联选择器 -->
          <el-cascader
            expand-trigger="hover"
            :options="cateList"
            :props="cateProps"
            v-model="selectedCateKeys"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- 标签页 -->
      <el-tabs v-model="activeName" @tab-click="handleClick">
          <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand">
                <template slot-scope="scope">
                    <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
                >
                <!-- 添加按钮 -->
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column prop="attr_name" label="参数名称"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                    <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
            <!-- 静态属性表格 -->
            <el-table :data="onlyTableData" border stripe>
                <el-table-column type="expand">
                <template slot-scope="scope">
                    <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
                >
                <!-- 添加按钮 -->
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
            </el-table-column>
                <el-table-column type="index"></el-table-column>
                <el-table-column prop="attr_name" label="属性名称"></el-table-column>
                <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                    </template>
                </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog :title="'修改'+titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
import { getCate_api ,getParams_api,addParams_api,getParamsById_api,editParams_api,deleteParams_api} from '@/api'
export default {
  data() {
    return {
      cateList: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      selectedCateKeys: [],
      // 默认选中的标签页
      activeName: 'many',
      manyTableData: [],
      onlyTableData: [],
      addDialogVisible: false,
      addForm:{
          attr_name:''
      },
      addFormRules:{
          attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
     // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取商品分类列表
    async getCateList() {
      const { data: res } = await getCate_api()
      if (res.meta.status !== 200)
        return this.$message.error('获取商品分类列表失败')
      this.cateList = res.data
      // console.log(res.data)
    },

    // 级联选择器的值发生改变时触发函数
    handleChange() {
      this.getParamsData()
    },

    // 级联选择器的值发生改变时触发函数
    async getParamsData(){
        // 证明选中的不是三级分类
        if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
        }
        // 证明选中的是三级分类
        // console.log(this.selectedCateKeys)
        // computed的函数 cateId
        const {data:res} = await getParams_api(this.cateId,{sel:this.activeName})
        if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
        }
        // 展开项
        res.data.forEach(item => {
            item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
            // 控制添加tag单独的值和显示隐藏
            item.inputVisible = false
            item.inputValue = ''
        });
        // console.log(res.data)
        if(this.activeName == 'many'){
            this.manyTableData = res.data
        }else {
            this.onlyTableData = res.data
        }
    },

    // 标签页改变时触发
    handleClick() {
      this.getParamsData()
    },

    // 关闭添加参数对话框
    addDialogClosed(){
        this.$refs.addFormRef.resetFields()
    },

    // 添加参数对话框
    addParams(){
        this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        console.log(this.addForm)
        const {data:res} = await addParams_api(this.cateId,{
            attr_name:this.addForm.attr_name,
            attr_sel: this.activeName
        })
        if (res.meta.status !== 201) return this.$message.error('添加失败！')
        this.$message.success('添加成功！')
        // console.log(res.data)
        this.addDialogVisible = false
        this.getParamsData()
        })
    },

    // 显示编辑修改对话框
    async showEditDialog(attrId){
        const {data:res} = await getParamsById_api(this.cateId,attrId,{
            attr_sel: this.activeName
        })
        if (res.meta.status !== 200) return this.$message.error('获取参数信息失败！')
        this.editForm = res.data
        this.editDialogVisible = true
    },

    // 关闭修改参数对话框
    editDialogClosed(){
        this.$refs.editFormRef.resetFields()
    },

    // 修改参数对话框
    editParams(){
        this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await editParams_api(this.cateId,this.editForm.attr_id,{
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
        })

        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败！')
        }

        this.$message.success('修改参数成功！')
        this.getParamsData()
        this.editDialogVisible = false
        })
    },

    // 根据Id删除对应的参数项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        '此操作将永久删除该参数, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      // 用户取消了删除的操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除！')
      }

      // 删除的业务逻辑
      const { data: res } = await deleteParams_api(this.cateId,this.editForm.attr_id)

      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }

      this.$message.success('删除参数成功！')
      this.getParamsData()
    },

    // 显示tag输入框
    showInput(row) {
        row.inputVisible = true;
        // 让文本框自动获得焦点
      // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },

    //   确认tag输入框
    handleInputConfirm(row){
        // 判断是否输入内容
        if (row.inputValue.trim().length === 0) {
            row.inputVisible = false;
            row.inputValue = '';
            return
        }
        // 如果没有return，则证明输入的内容需要做后续处理
        // 把输入的内容添加到inputValue中
        row.attr_vals.push(row.inputValue.trim())
        // 添加后清空恢复状态
        row.inputVisible = false;
        row.inputValue = '';
        // 发送请求保存值
        this.saveAttrVals(row)
    },

    // 保存tag添加操作
    async saveAttrVals(row){
        console.log(row)
        const { data: res } = await editParams_api(this.cateId,row.attr_id,{
            attr_name: row.attr_name,
            attr_sel: row.attr_sel,
            attr_vals: row.attr_vals.join(' ')
        })

        if (res.meta.status !== 200) {
          return this.$message.error('修改失败！')
        }

        this.$message.success('修改成功！')
    },

    // 删除tag
    handleClose(i,row){
        row.attr_vals.splice(i,1)
        this.saveAttrVals(row)
    }

  },
  computed: {
      // 如果按钮需要被禁用，则返回true，否则返回false
      isBtnDisabled(){
          if (this.selectedCateKeys.length !== 3) {
            return true
        }
        return false
      },
    //   监听获取分类id
      cateId(){
        if (this.selectedCateKeys.length === 3) {
            return this.selectedCateKeys[2]
        }
        return null
      },
    //   动态计算标题的文本
      titleText(){
          if (this.activeName === 'many') {
              return '参数'
          }
          return '属性'
      }
  },
}
</script>
<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
    margin: 0 10px;
}
.input-new-tag {
    width: 90px;
    margin-left: 10px;
    vertical-align: bottom;
  }
  
</style>